Abstract: A well packer has a casing engaging slip mechanism and a packing element carried on a tubular body which is released from the slip assembly enabling setting of the slips and packing by an upward pull on a running in string of pipe. The body and the expander for the slips are locked to hold the packer set. A length of tubing extends through a seal in the body and is released to be slideable in the body enabling temperatue change responsive elongation and contraction of the running pipe, without affecting the packer. A shearable release enables retrieval of the packer assembly by pulling on the running pipe. An emergency release of the running pipe is accomplished by releasing a guide on the end of the slideable tubing.Well bore packers are frequently used in well casings, with a tubular string of running and retrieving pipe or tubing associated with the packer and held in tension. In the presence of high temperatures, the resultant expansion of the tubing tends to relieve the tubing tension.